Commutator-terminal and method of mounting same.



H. H. PHILLIPS.

COMMUTATOR TERMINAL AND METHOD OF MOUNTING SAME.

APPLICATION FILED APR. 11. 1914.

1,297,903. Patented Mar. 18,1919.

UNITED STATESPATENT OFFICE.

HENRY HARRISON PHILLIPS, OF NIAGARA FAI ILS, NEW ASSIGNOIQ, IBY MESNE ASSIGNMENTS, TO U. S.'LIGH'1 .& HEAT CORPORATION, OF NIAGARA FALLS, NEW

YORK, A COQPORA'IION OF NEW YORK.

COMMUTATOR-TERMINAL AND METHOD OI MOUNTING SAME.

Specification of Letters Patent.

Application filed April 17, 1914 Serial No. 832,453.

improved means for attaching a commutator terminal' to a commutator segment.

Another object of my invention is to provide an improved commutator termina l.

A further object is to provide an 1mproved method of attaching a commutator terminal to a commutator segment.

Other objects of my invention will hereinafter appear.

I have illustrated one embodimentpf my invention in the accompany ng drawing, n which:

Figure 1 is a perspective view of the com-.

mutator terminal;

Fig. 2 is a perspectiveview of the commutator segment.

Fig. 3 is an end view of the commutator segment with the terminal in place.

Fig. 4 is a section taken on the line 4-4 of Fig. 3. i

Fig. 5 is an end-view of a sectlon of a commutator showing a plurality of segments and terminals in assembled position.

The commutator segment has a terminal 11 attached thereto in a manner herein= after described.

The terminal 11 is made from two strips 12, 12,. referably of soft metal, riveted together ace to face by the stud 13 and comprises a shank 14 having a fork-like or bifurcated end 15, adapted for ready connection to the armature coils of a dynamo-electrio machine. .The bifurcated end 15 is formed by ofi-setting the ends of the strips from each other.

A channel or groove 16, adapted to receive the shank of the commutator terminal, extends vertically across one end of the commutator segment 10. This channel is preferably milled but may be formed in various other ways. It is made of eater depth than the width of the shank 0 the terminal, so that its edges may be burred over to assist in holding the terminal in place. The object of burring the edges of the channel over is to provide flanges or shoulders adapted to hold the terminal in position. Any other method of providing said flanges or shoulders may be employed. Suitablerecesses 17 are provided in the walls of the channel by counter-boringthe end of the segment, and the shank of the terminal is expanded into these recesses. In this way the terminal is securely held against dislodgment. It is ob vious that various other means may be employed for securing the terminal within the channel.

. Patented Mar. 18, 1919.

In assembling the parts, the shank of the terminal is fitted into the channel in the commutator segment, and-blows are struck at the points 18, 18, with a chisel-shaped tool to .throw an overhangingbur'or flange 19 along the edges of the channel. At the same time, an expanding tool is driven in between the terminal strips at the point 20, which expands-them into the recesses formed in the walls of the channel by the counterbore. The shoulders 21, formed on the strips by the expanding .tool hold the tenninal rigidly in place, and dislodgment, due to the action of centrifugal force when the commutator is in motion, is absolutely pre-' vented. After the terminal has been secured in place in this manner, it may then be soldered into the channel by any suitable process.

The embodiment of my invention described herein hasbeen selected merely for the purpose of illustration. My invention covers all equivalent means for accomplishing the desired result so long as such means fa 1 within the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent'of the United States is:

1. In combination, a commutator segment having a groove at one end, a wall ofsaid groove being provided with a recess, a commutator terminal carried in said groove, said terminal being provided with a projecting portion fitting into said recess, said segment aving a projecting portion engaging the side of said terminal to hold same against edgewise mo ement.

2. In combination, a commutator segment having a groove in one end, a commutator terminal carried in said groove, said terminal being provided with means to prevent longitudinal movement in said groove, said groove being deeper than the Width of said' terminal, whereby the walls of said groove may be flanged over to engage the side of said terminal to hold same against edgewise movement permitting the ready securing of the terminal after the commutator is assaid groove to engage the side of said terminal, whereby said terminal may be readily secured in said segment at any time.

4. The method of securing together a commutator segment and a terminal which conv sists of providing a groove in said segment of a de th greater than the width of said termin'a, inserting said terminal into said groove and striking the end of said segment at places adjacent said groove to throw an overhanging flange along said terminal whereby said terminal may be readily secured in said segment at any time.

5. The method of joining a terminal having a pair of shanks to a commutator segment having a groove in its end, said groove having a pair of recesses communicating therewith which consists of inserting said shanks in said groove, expanding portions of said shanks into said recesse and burring over the walls of said groove to engage the side of said terminal.

In Witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

HENRY HARRISON PHILLIPS.

Witnesses:

WM. A. TURBAYNE, E. MAOVITTIS. 

